Obviously a lot more can be said about the effect each tube type has on tone but the best thing to do is have a listen for yourself and make your own determination on what type you prefer in your amp. Then connect to your amplifier,begin to enjoy music. there are some other 12AU7A/12AU7 that I prefer in my Vincent SAT1 Pre Amp and work better, there. They are fabulous if you are looking for a greater. Any 12AU7 tube aficionados out there? (NEW) Emotiva Forums - v. The Absolute Sound reviewed the FX DAC and Amp in their April 2012 issue and stated, "the Jolida Glass Tube DAC and Glass FX-10 amp are great music-makers, capable of wonderfully rich yet nuanced playback on all genres I triedaffordable, compact, great sounding, upgradable, and entirely attractive. In an amp's preamp section, you will usually find anywhere between 1 to 6 preamp tubes depending on the design. 12AX7 vs 12AT7 0 Members and 1 Guest are viewing this topic. These tubes have a brace or flange that runs the entire length of the plates. The Long-Tail Pair. The All Star Amperex Bugle Boy QB for the 12AU7's has been running around all day. Jan 30, 2003 · Good post, Edmond. en vente une rare paire de VINTAGE E80CC MINIWATT LOGO VERT LARGE O GETER tubes testés comme neuf sur mon Métrix 310CTR. recalculate. 95: Good 12AT7 and 12AU7 current production (7. Jul 15, 2008 · 12AT7's have less gain than a 12AX7 so it can clean up a stage. They can pass much the same amount of current. Whether or not that's a good thing depends on your ears. At the same time, the series 12AX7, 12AU7 and 12AT7 was designed, of which 12AU7 is relatively close to 6SN7, l but not identical. AMPEREX Bugle Boy 12AU7 used/tested 12AU7 nice logos $40 ea. Apr 12, 2014 · One of these should calm things down a bit. 12AU7 was a general-purpose type, with lower gain, but more robust; this guy was used in all types of audio, video. Also, the 12AX7 has way too much gain to drive a 12AU7 output stage unless you're using MASSIVE feedback. RCA and Sylvania first introduced the 12AX7 to the world in the late 1940's. The 5814A is a military/industrial grade 12AU7 with low noise and high-reliability spec. you can sub in 12au7 but with lower gain i believe, in fact i brought over a couple of 12au7's and we put them in the 12ax7 slots with great results. 12AX7 ? Discussion in 'Tech I swapped out the AX7 in the first slot with a 12AT7 (ECC81), which is a lower output tube. FAQ; Logout; Register; Home Forums At the Workbench Tube Talk; Donations. In fact the functional description in my Sylvania tube manual gives it as "Amplifier and phase inverter". Radio tubes are valves. The 5965 has only 2/3 the gain of a 12AT7, and is not suitable for most applications calling for a 12AT7. 5814 / 5814A / 5814WA GE 1953 - 1970's (5814A is a direct substitute and a ruggedized 12AU7, also see 5963 and 6189) (The best 5814A are Siemens Germany, RCA black plates and JG or 5 Star GE) - Woo Audio WA4 headphone amp - TRON Seven phono (can only use 5814WA only) - Bottlehead Crack TO BUY 5814A GE. Separate them by type—mutual conductance testers in one group, emissions testers in another. Does anyone know how the Amperex Bugle Boys sound compared to them? Home: Lampizator Amber DSD DAC -> Eddie. Grant Fidelity imports and sells generic Shuguang tubes as well as their high-end counterparts for amplifier use, the Treasure Series®. Basic Theory - how to design preamp and power amp circuits. Very smooth and warm sound. there are some other 12AU7A/12AU7 that I prefer in my Vincent SAT1 Pre Amp and work better, there. It's high gain makes it popular in guitar amps, though it's also widely used in HiFi amps, especially in phono stages. You probably won't want to change back to the 12au7 after doing this. The 12AT7 is used in many hi-fi applications, as each triode operates as a class A amplifier. Radio tubes are valves. Look at the datasheets. 12AU7 is also known in Europe under its Mullard-Philips tube designation ECC82. I have a Cayin HA-1A and which uses 12AX7, 12AU7 and two EL84. It's harsh and brittle when used as a "real" preamp tube. SPECIAL OFFERS. The new tube linestage design includes six regulated power supplies, two for each 12AT7 tube section and one for each of the 12AU7 tubes. A cross reference is included here:. The difference being in the cosmetic appearance. Oct 26, 2014 · Even though you have done well with the 12AU7 designs in the past I think you should go forward with the 6922/6DJ8 design. It belongs to a large family of dual triode vacuum tubes which share the same pinout (RETMA 9A). The 12AU7 and its variants are a miniature nine-pin (B9A base) medium-gain dual triode vacuum tube. Speaking of tubes, for 12AY7 type, which one is better between a Mullard 12AY7 and a GE 6072? Also, how would you compare the gain and sound characteristics of a 12AT7 vs a 5751? Lastly, if the mic pre will be used mostly for male vocal, what combination of tubes would you recommend or prefer to use, personally? Just wanting to get your opinion. Grading and Matching. They have a large plate format, superior dissipation over the originals. It is especially suited for use in resistance-coupled voltage amplifiers, phase inverters, multivibrators, and numerous industrial-control circuits where high voltage gain is desired. Our new EHX Strings Electro-Harmonix electric guitar strings are custom-designed to our specifications and made in the USA by a premiere string manufacturer. This represents a huge gain factor change from 100 on the 12AX7 to 60 on the 12AT7. For reaching the design parameters of the original valve only valves that are directly equivalent should be used. Tube Testing. Provides a very smooth sound with well-defined tones suitable for audio and guitar amplifiers. I tried one in my SE 6L6 amp to lower the gain, and it. 12AX7 vs 12AT7 0 Members and 1 Guest are viewing this topic. 00 All tube. I have since re-tubed it with a 12AU7 in the preamp stage and a 12AT7 for the inverter. The 12AT7 and 12AU7 just don't sound right and I remember a guy saying he used a 12AY7 in a JCM 900 and it sounded good so I'm thinking of giving it a shot. Some of them also check for some sort of gain; often a "transconductance" is measured. D 12AX7/12AU7 - EL-84 Outputs - SS Rectifier 12AT7 Drivers - 832A Outputs - 5AR4/GZ34 Rectifier Completed 2/10/2006 From AudioHobbyist. ECC81 is the European equivalent. It's a duo triode in which one is like a 12AX7 and the other is like a 12AU7. Tube 12AT7 or Röhre 12AT7 ID3539, Double Triode, Noval, B9A and VHF shown. Tone (using 12at7/12au7) An advantage of using 12at7 or 12au7 is that the preamp hasn't that much gain anymore You have to turn your vol. Provides a very smooth sound with well-defined tones suitable for audio and guitar amplifiers. Doesnt really matter if i loose some volume since i never play it over 6 anyway :´( (2266 btw) Cheers, BluesDoggydog. A must buy for owners of tube amps with ECC82/12AU7. tube 6550 or röhre 6550 id6062, beam power tube, octal (int. A wide variety of 12au7 socket options are available to you,. I replaced the stock Russian Groove Tube 12AT7 in V2 (Reverb Send Position) on my Fender 65 Princeton Reverb Reissue with the JJ 12AT7. Get the guaranteed best price on Preamp Tubes like the Bugera 12AX7B Preamp Tube at Musician's Friend. Walking Dead, Game oF Thrones, Back to the Future. I believe by now, a lot of people know that the PSVane T-tubes are good. Sold in matched pairs matched on Amplitrex AT1000. NOS 1960 USA made 5963 SQ equivalent of ECC82, 5814, 12AU7. Many thanks to Bill Beech, NJ7P for his efforts in providing the data found on this site!. The 12AU7 is designed to deliver buckets of current, not a beautiful preamplified signal. Vacuum Tube Warranty & Return Policy. Browse our vast selection of NOS & New Production 12AU7 / ECC82 vacuum tubes. At the same time, the series 12AX7, 12AU7 and 12AT7 was designed, of which 12AU7 is relatively close to 6SN7, l but not identical. This tube has a mu factor of 60, as compared to the higher gain 12AX7 with a factor of 100, and the 12AU7, with a mu of only 20. JJ Electronic JJ tubes are The JJ ECC81 (12AT7) is low noise tube with little microphonics. 00 each The 12AU7, 12BH7, and 6CG7 have very similar electrical characteristics and can usually be substituted for each other. Great if you want to beef up output from a DAC or preamp that normally uses 12AU7 tubes. Continuing on, we quickly learned that the method most people used to compare tubes, which is to set the tone controls to one place and leave them for the entire test was inadequate. We also offer high quality and hard to find parts for DIY tube amplifier projects. HHScott reference for fans of vintage vacuum tube Scott consumer hi-if components from 1946 to 1966. Swap out the preamp tubes. But I'm not sure if any one of your customer have done a direct comparison to a brand new NOS tube. 11K vs 63K. Source Legend: DC Dave Cigna / Francesco Piazza DM Me!. EDIT: was thinking maybe the recovery circuit needs more gain, just a thought. What is NOT normal is a flash from power tubes. May 23, 2013 · The 12ax7 is a miniature high-mu twin triode, each section of which has an individual cathode connection. 12at7 Discussion in 'Amp 12au7 is very low mu (20) and probably won't work well. are all interchangeable but offer different mu factors. I want to try more options at the 12AU7 position. This flash is normal. 12AX7 (also known as ECC83) is a vacuum tube that is a miniature dual triode - 6AV6 with high voltage gain. But I'm not sure if any one of your customer have done a direct comparison to a brand new NOS tube. McIntosh Tuners A History. This tube has a specially designed cathode which can withstand long periods of time in cut-off without hurting the tube. Just an added bonus to have it. It was released for public sale under the 12AX7 identifier on September 15, 1947. I use them in lots of different spots on even my high gain amps (especially reverb, PI, and input buffer). 12AU7 takes more current. Steve, Could you tell us your ranking of the 12AU7's. Also available with current Balanced triodes for phase inverter use and Balanced and Matched in pairs or multiples. 12AX7 vs 12AT7. Amperex 12AU7 used/tested orange print $30. The 7025 is supposed to be a slightly lower noise version, but the operating characteristics are the same. This is used much less as a preamp tube because of the. The 12AU7 is the last tube on this list and it has the lowest Gain, with an amplification factor of 20. These tubes have a brace or flange that runs the entire length of the plates. The 12AU7 in the preamp gives a nice clean sound, and the 12AT7 inverter helps prevent overdriving the power amp. The 12AU7 has a gain factor of 19. mullardtubes. Electro-Harmonix is rocking the vacuum tube community with the superior quality of the "EH" series tubes. This 12AU7 is a favorite amongst our customers and sold in green/yellow Amperex boxes. Does anyone know how the Amperex Bugle Boys sound compared to them? Home: Lampizator Amber DSD DAC -> Eddie. (The driver or phase inverter is the 12AX7 located nearest the power tubes. 00 per pair. McIntosh Tuners A History. The 12AT7 and 12AU7 just don't sound right and I remember a guy saying he used a 12AY7 in a JCM 900 and it sounded good so I'm thinking of giving it a shot. I like it a lot more than the 12AU7 in the same amp. Most of them do *not* measure transconductance or Gm, but rather tube gain or mu. This Mullard 12AU7 reissue is a remake of the original. 12at7 e2157 12at7 e81cc 12at7 ecc81 12at7 qb309 12at7wa cc81e 12at7wa m8162 12at7wa qs2406 12at7wb qa2406 12au6 hf94 12au7 12ax7 12au7 b329 12au7 b749 12au7 e2163 12au7 e82cc 12au7 ecc186 12au7 ecc82 12au7a 12ax7 12av6 12bc32 12av7 12r-ll3 12ax7 12ad7 12ax7 12au7. All selected and tested on the Amplitrex AT1000. Shop 12AT7 Tubes on Reverb. The phono stage really isn't that important to me. If you have known brands and they test good you could probably sell them for decent money, especially if you can match them. Just imagine a chassis with four noval tube in the center, flanked by 300Bs. replacing the 12AX7 with a 12AT7 gives them the opportunity to play cleaner and. If your theory were true how would you explain a 12DW77?(do some research if you don't know what it is). the 12at7 probably only starts to breakup about 9 or more on the volume. So stick to the 12AX7, 5751, and 12AY7 for your preamp. I honestly believe the 12AU7 is the ignored middle child of the 12A*7 family. 12AU7 Holland made tubes (same factory as the Bugleboy) produced and screened for critical use in medical equipment. Read 12195 times. The 5963 has a max plate voltage of 250V while 12AU7 has a max of 330V. Amplification factor is 27 to 31 vs. The 12AU7 is the last tube on this list and it has the lowest Gain, with an amplification factor of 20. 53) Posted by Damir on 2004-03-25, 13:06:23 (213. Look at the difference in circuit constants in audio voltage amplifiers utilizing the 12AX7, 12AT7, or 12AU7 tubes. It belongs to a large family of dual triode vacuum tubes which share the same pinout, including in particular the very commonly used low-mu 12AU7 (ECC82) and high-mu 12AX7 (ECC83). However, since you haven't told us anything about the amp I can only guess. As you can see, it shares similar pin connections with it's cousins, but these tubes are not. ) The 12AT7 is rarely used in a tone-generating stage, but rather in function stages, so the Groove Tubes GT-12AT7 is selected for durability. 20 I have them in the pre-amp tube and 12AU7 drivers. DIY 12AU7 Tube Preamplifier. So it makes for a very dark and quiet amp. Very smooth and musical. About Hi Test. A wide variety of 12au7 socket options are available to you,. The 12AY7 and 6072 are the tube designations for a dual triode with medium gain that shares the same pin-out configuration as the 12AX7 and its variants. You aren't actually getting 60 mu out of a 12AT7 in a 12AX7 slot, and you aren't getting anything close to 45 mu from a 12AU7. 53) Posted by Damir on 2004-03-25, 13:06:23 (213. Follow the links on the left to find the tubes, valves, sockets, grid caps, and capacitors for your antique radio, ham radio, hi-fi stereo, or other electronic piece. you can sub in 12au7 but with lower gain i believe, in fact i brought over a couple of 12au7's and we put them in the 12ax7 slots with great results. They are fabulous if you are looking for a greater. New tubes always pep up your amp, and substitutions can give you a whole range of new tones. FAST SHIPPING and personal service always. there are some other 12AU7A/12AU7 that I prefer in my Vincent SAT1 Pre Amp and work better, there. 12AU7 Holland made tubes (same factory as the Bugleboy) produced and screened for critical use in medical equipment. I expect some changes of course as time goes on, but right away they sound very nice. The All Star Amperex Bugle Boy QB for the 12AU7's has been running around all day. Type 12AT7 was first introduced in 1947. If so I suppose I could balance a little with the choice of 12AT7? The NOS Mullard are my favorite 12au7 and one. I do realize the pinout is different. The thin glass tube envelope is 20 mm in diameter and excluding B9A base pins the length is 47 mm. I installed 12AT7s in my Hot Rod, and I couldn't be. pot up means less resistance to the grid and more brilliant tone. I think 12AU7, with its low gain, is the least sensitive to brand. A 12AU7 can take a much higher amount of plate current than a 12AX7 so by substituting the "12AU7" side, you increase the gain and lower the headroom, and an SVT already has TONS of gain. The cathode follower has a higher voltage difference between the cathode and heater which only the 12AX7 and 12AU7 can adequately handle. However, since you haven't told us anything about the amp I can only guess. I'm not sure what motivated me to decide on building a high-gain tube preamp of this sort. A 12ax7 will only dissipate 1 watt max vs 2. Follow the links on the left to find the tubes, valves, sockets, grid caps, and capacitors for your antique radio, ham radio, hi-fi stereo, or other electronic piece. If so I suppose I could balance a little with the choice of 12AT7? The NOS Mullard are my favorite 12au7 and one. 12AU7 was a general-purpose type, with lower gain, but more robust; this guy was used in all types of audio, video. They don't simply mean the type of vacuum tube (for example, 12AT7 versus 12AU7) - they already know the type that they will be using. Funny you should ask. But even this tube will not work in all 12ax7 applications. 12AT7's have a lower voltage gain than 12AX7's. Vintage SVTs used a pair. A great tube and a great choice. Jul 16, 2018 · Some players find that a 12AT7 yields a slightly dull, cold tone when used in the V1 position, but that conclusion seems to vary from amp to amp, and indeed player to player. 12AU7 is identical to a 6CG7 electrically and in the circuit it will function identically. One thought on " ECC82 12AU7 E82CC ECC802S " julius March 4, 2015 at 3:55 am. These are rough estimates as each tube will have its own electrical characteristics and just swapping one (new) 12AX7 for another (new) 12AX7 could result in slight higher or lower gain from the circuit. pot up means less resistance to the grid and more brilliant tone. Follow the links on the left to find the tubes, valves, sockets, grid caps, and capacitors for your antique radio, ham radio, hi-fi stereo, or other electronic piece. A 5751 is much more similar to a 12AX7, but with lower gain (70%). I have a Cayin HA-1A and which uses 12AX7, 12AU7 and two EL84. MESA 12AT7 is a premium grade, classic low gain preamp tube most often used as a reverb driver and/or phase inverter in older amplifiers - Used as a reverb driver in older MESA/Boogie designs, such as the Studio Preamp and some Mark Series amplifiers. Source Legend: DC Dave Cigna / Francesco Piazza DM Me!. Many thanks to Bill Beech, NJ7P for his efforts in providing the data found on this site!. You might also like this HumbuckerSoup article: Preamp Tube FAQ - Frequently Asked Questions about 12AX7, 12AT7, & 12AU7 The 12AU7. As you can see, it shares similar pin connections with it's cousins, but these tubes are not interchangeable. The Absolute Sound reviewed the FX DAC and Amp in their April 2012 issue and stated, "the Jolida Glass Tube DAC and Glass FX-10 amp are great music-makers, capable of wonderfully rich yet nuanced playback on all genres I triedaffordable, compact, great sounding, upgradable, and entirely attractive. Please post if you know any. ECC82 / 12AU7 + ECC83 / 12AX7 ECC81 / 12AT7 tubes Excellent pairs of BALDWIN organ grade tubes, chosen for and sold to Baldwin Organ. Whether or not that's a good thing depends on your ears. As seen with the 12V Superhet, ordinary mains valves work quite well with low voltage, with the main limiting factor being audio power output. Source Legend: DC Dave Cigna / Francesco Piazza DM Me!. tube 6550 or röhre 6550 id6062, beam power tube, octal (int. These are rough estimates as each tube will have its own electrical characteristics and just swapping one (new) 12AX7 for another (new) 12AX7 could result in slight higher or lower gain from the circuit. Audio Classics 800-321-2834 or 607-766-3501: CATEGORIES Accessories (21) Electro-Harmonix 12AU7-EH 12AU7 Gold Plated Genalex 12AT7GENGP Gold Lion 12AT7 ECC81. Also available with current Balanced triodes for phase inverter use and Balanced and Matched in pairs or multiples. They have a large plate format, superior dissipation over the originals. A new driver design using a 12AT7 in place of the 12AU7 for the driver. Of the three types, the 12AU7 provides the least amount of gain, and because of this it is rarely used in guitar preamps and is much more commonly found in the reverb section of the amplifier. Vacuum Tube Warranty & Return Policy. Hi all, I've been tube rolling for over a year and trying to find the best alternative for 12AU7 and 12AT7, finally found the best Tubes IMO, I found Dario 18ECC miniwatt pinched waist best for the 12AT7, slightly less mu 40 vs 60 but it gives the best sound on my Leben phono, for the 12AU7 I found E80CC the best!. A lot of positive press around these tubes. The 5963 has a slightly lower plate voltage rating compared to regular 12AU7. Valve complement: 1 x 12AX7, 2 x 12AU7, 2 x 12BH7, 2 x 12AT7, 4 x KT88. The 12AT7 is a high-frequency twin triode in a small 9-pin miniature glass package. Perfect for mellow blues tones. Circuit Simulation - a step-by-step tutorial for testing the results. the 12at7 probably only starts to breakup about 9 or more on the volume. Transconductance on a real 5751 is about 1200. Tube 12AT7 or Röhre 12AT7 ID3539, Double Triode, Noval, B9A and VHF shown. RCA engineers developed it around 1946 and released it for sale as the 12AX7 shortly after. Except it's in European, 12AX7 = ECC83, 12AU7 = ECC82, 12AT7 = ECC81. A 12ax7 will only dissipate 1 watt max vs 2. Reading it is a copy of a engl 50? Maybe try to find that schematic. available for $99. This tube has a mu factor of 60, as compared to the higher gain 12AX7 with a factor of 100, and the 12AU7, with a mu of only 20. 12AT7 = ECC81 = CV4024 = M8162 = 6201 = 6060 = B309 = CV455 = 6679: 12AU7 = ECC82 = CV4003 = M8136. A Mini Review of Three 12AT7 Tubes. Arguably the Best sounding American 12AU7's ever made are the RCA Clear Tops and Tung-Sol's. Look for a 6SL7 or 6N1P tube. Because the current draw of a 12AT7 is similar to the 12AU7, in most applications a 12AT7 it can be substituted for a 12AU7 and the primary considerations are more gain (louder sound) and the perceived quality of the sound. Circuit Simulation - a step-by-step tutorial for testing the results. Priority, UPS Ground vs. I have a Cayin HA-1A and which uses 12AX7, 12AU7 and two EL84. Comparatif des gain pour les lampes ded préamplification 12AX7, ECC83, 12AT7, 12AU7, 12AY7, et 5751. The Golden Dragon 12AU7 is another popular preamp tube offering slightly more output than the 12AT7 whilst still retaining low levels of microphony and as a result is commonly used as the phase inverter in higher power amps to achieve a cleaner sound. Get the best deals on Amperex 12au7 when you shop the largest online selection at eBay. 12AT7 / ECC81 Tubes. But, you can substitute others in without fear; two examples would be 12AT7 and 12AU7 tubes. RCA engineers developed it around 1946 and released it for sale as the 12AX7 shortly after. Not all that surprising, as a 12at7 give only about 70% of the gain of a 12ax7. 12AT7: high-frequency dual triode 9-pin miniature glass vacuum tube with a mu factor of 60, the higher gain 12AX7 has a factor of 100, whereas 12AU7, is only 20 in comparison. 12AX7 vs 12AT7 0 Members and 1 Guest are viewing this topic. These are all pin compatable with one another, the only differences being the gain factor of each tube. Because the current draw of a 12AT7 is similar to the 12AU7, in most applications a 12AT7 it can be substituted for a 12AU7 and the primary considerations are more gain (louder sound) and the perceived quality of the sound. Today, it is by far the most common preamp tube used for electric guitar amplification and there is an almost overwhelming supply of current production options to choose from. DIY 12AU7 Tube Preamplifier. Just bought a s/h Fender Hot Rod Deluxe iii. NOS 1960 USA made 5963 SQ equivalent of ECC82, 5814, 12AU7. 12AU7 Tubes 12AT7 Tubes 12BY7 Tubes 12AU6 Tubes 12AV6 Tubes 12AT6 Tubes 12BA6 Tubes 12BEG Tubes 12BY7 Tubes From $25. They have a higher plate current and transconductance, and are commonly used as reverb drivers and phase inverters. The 12AX7 family of dual-triode preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. 12AU7 is also known in Europe under its Mullard–Philips tube designation ECC82. It really enjoyed playing it cranked with my strat and les paul. 12AT7 (also known in Europe by the Mullard–Philips tube designation of ECC81) is a miniature 9-pin medium-gain (60) dual-triode vacuum tube popular in guitar amplifiers. I purchased a quad of the new PSVANE 12AU7-T for my Octave Jubilee preamplifier and based on my experiences compared with other tubes I have rolled; I am pretty confident that the PSVANE tubes are one of the better new tubes in the market today. McShane Design - Citation & Other Vintage Tube Gear Fine Vacuum Tubes & Vacuum Tube Parts/Kits Now - Pay By Credit Card or PayPal! See "How To Order" below! Need tubes? Scroll down for a huge list of new production, NOS, and great used tubes. I've noticed some confusion here and there on the net, so I thought I'd. Tube roll it with more “branded” tubes and you would probably raise the level of quality on this preamp even higher. Difference between 12AU7 and 12AU7A Anyone out there know what the difference between these two tubes is? All 9 pin mini dual triodes suppossedly can be rolled into the voltage amp stage of my Llano Trinity 300. this is a question that, as a beginner builder, confused me quite a bit. Silver / Black without tube option, we send the preamp without preamp tube, except decoration tube and rectifier, so you need plug your 12au7 and 12at7 tube after received the preamp to work with it. 75 watts per triode so the total max dissipation is 5. Questions? Comments? Bug Reports? Would you like to see a tube added to the Database? Send us email: [email protected] 12AU7 is similar to ECC82 and 6189 and can be used interchangeably. com offers 75 12au7 socket products. Quick links. However, since you haven't told us anything about the amp I can only guess. Jul 16, 2018 · Some players find that a 12AT7 yields a slightly dull, cold tone when used in the V1 position, but that conclusion seems to vary from amp to amp, and indeed player to player. I expect some changes of course as time goes on, but right away they sound very nice. The 12AU7 has even lower internal resistance than the 12AT7 and even less gain (20 percent of a 12AX7). The 12AU7 is a miniature medium-mu twin triode. They have a higher plate current and transconductance, and are commonly used as reverb drivers and phase inverters. These won’t give you breakup at lower volumes if that’s what you seek. Turned off the pre-amp, took out the mullards, left the volume level unchanged, and popped in the "Grade-A Psvane 12AU7-T Mark 2's" into the pre-amp. The Toshiba 12AU7 tubes in this precisely matched pair were made in Japan and labeled for Baldwin organs. Because the current draw of a 12AT7 is similar to the 12AU7, in most applications a 12AT7 it can be substituted for a 12AU7 and the primary considerations are more gain (louder sound) and the perceived quality of the sound. 00 each The 12AU7, 12BH7, and 6CG7 have very similar electrical characteristics and can usually be substituted for each other. Shuguang Vacuum Tube 300B Series Triode: 300B-98 (300B) DESCRIPTION 300B-98 is compatible with 300B Vacuum tube 300B-98 is new and improved version of 300B. This procedure does not allow you to get acquainted with the capabilities of the tubes. Click here to buy complete sets of tubes for your Z amps from The Tube Store. Continuing on, we quickly learned that the method most people used to compare tubes, which is to set the tone controls to one place and leave them for the entire test was inadequate. Darren Riley's Guitar & Amp Shop. Long plates type, sound and build is comparabele to Telefunken ECC802S. The Marshall/Fender phase inverter is commonly known as a "long-tail pair", or "Schmitt" type phase inverter, or phase splitter (actually, the original Schmitt inverter was a differential pair with a large "tail" resistor; the "standard" guitar amplifier phase inverter is a self-biased version of this circuit that works better with positive-only power supplies and. They're both dual triodes and share the same basing, but they're different enough that it's pointless to compare their "sound" because they won't work optimally in the same circuits. Chinese Psvane 12AU7-T MKII. One thousand Vox "30th Anniversary Limited Edition" AC30 amps would be produced in 1990 and 1991. radio tubes are valves. Apr 05, 2010 · Amidst this Bravo/Indeed headphone amp craze, i ended up buying the 12AU7 version, when most people ended up buying the 6922 version ;D So. I know NOS RCA'S are great, but I believe the RFT made the biggest difference. Steve, Could you tell us your ranking of the 12AU7's. NOS/NIB Preamp Tubes. So, what tube do you guys think would be best for me? My idea is to put it in the v2 for a little less gain and a little warmer sound in HDR, 5751 vs 12ay7 vs 12au7. I’m glad it has it, but I’ve got external phono stages already that punch well above what the Doge could offer. ideal for phono stages. I must admit I quite liked the result as the amp kinda screamed right after that. 12AT7 Amplifier. About 40% of these are Plugs & Sockets. Look for a 6SL7 or 6N1P tube. If the amp used only one triode then the max dissipation would be 2. 00 All tube. リード工業 BREEZ DRAGGER2 フルフェイスヘルメット ハーフマットブラック Mサイズ【同梱・代引き不可】,TOYOTIRES トーヨー プロクセス スポーツ PROXES Sport サマータイヤ 225/55R17 WEDS ウェッズ Leonis レオニス NAVIA 06 ナビア06 ホイールセット 4本 17インチ 17 X 7 +53 5穴 114. We do not recommend 12AT7's as a 12AX7 substitution. I'm guessing that your output transformer impedance is too low. However, since you haven't told us anything about the amp I can only guess. 5ma or so; 12AT7s and 12AU7s are, depending on manufacturer, rated between 15-25ma). D 12AX7/12AU7 - EL-84 Outputs - SS Rectifier 12AT7 Drivers - 832A Outputs - 5AR4/GZ34 Rectifier Completed 2/10/2006 From AudioHobbyist. Great for phono preamps and microphones. These are all pin compatable with one another, the only differences being the gain factor of each tube. Many European tubes in the 12AU7, 12AT7, and 12AX7 families may flash brightly when you first power up your gear. The 12AX7 Valve (or 12AX7 vacuum Tube) is a small preamplifier valve which is identical to the ECC83 - same valve, just a different name. Apr 12, 2012 · Since in a lot of cases 12at7 is used in current amplification circuits, it has very little to do with gain (mu), so gain here is not relevant and theoretically 12au7 & 12ax7 could be used in place of 12at7. For reaching the design parameters of the original valve only valves that are directly equivalent should be used. I do however notice that the reverb still sounds superb. ECC81/12AT7 Page 1 of 4 Telephone: +381 18 550 741 ECC81 is R. Look for a 6SL7 or 6N1P tube. Source Legend: DC Dave Cigna / Francesco Piazza DM Me!. The 12AU7 is the last tube on this list and it has the lowest Gain, with an amplification factor of 20. Price = for one pair = 2 tubes. Oct 26, 2014 · Even though you have done well with the 12AU7 designs in the past I think you should go forward with the 6922/6DJ8 design.